This tutorial was drafted with AI assistance. Its small JavaScript fixture was executed locally; it is not a production incident report. A test that passes alone and fails after another test is often called flaky. That label describes the symptom, but it is a poor implementation brief. Before assigning a repair, make the order dependence explicit. This example uses a shared cache. It gives a coding agent a failure that can be reproduced without waiting for CI to get unlucky, plus an accep...